Possible Definitions:
1. Twinkle (v. i.) To open and shut the eye rapidly; to blink; to wink.
2. Twinkle (v. i.) To shine with an intermitted or a broken, quavering light; to flash at intervals; to sparkle; to scintillate.
3. Twinkle (n.) A closing or opening, or a quick motion, of the eye; a wink or sparkle of the eye.
4. Twinkle (n.) A brief flash or gleam, esp. when rapidly repeated.
5. Twinkle (n.) The time of a wink; a twinkling.